<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    var arr = [{label:'男',value: 1}, {label:'女',value: 0}]
    function f(arr) {
      // 写代码，得到
    //   使用map对数据进行加工,返回label的属性值
      return arr.map(item => item.label)
    }
    // 在赋值给arr2
    const arr2 = f(arr)
    console.log(arr2);
    // arr2 = ['男', '女']
  </script>
</body>

</html>